Continental Automotive S180020 Tire pressure monitoring system User Manual Annex No

Continental Automotive GmbH Tire pressure monitoring system Annex No

Contents

User Manual

Annex No.5 Page 1 of 6 Functional description S180052020
1of5User Manual / Functional Descriptionof theContinentalTire Pressure Generation 1C wheel unitTypeS180 052 020
2of51.SYSTEM OVERVIEWThe tire pressure monitoring system (referred as TG for Tire Guard) consists of the followingunits:-Tire guard wheel unit typeS180 052 020which includes an integrated pressure, temperatureand acceleration sensor and a RF transmitter.-RF receiver unit which includes a RF receiver (not described in this document)The TG monitors a vehicle'stire pressure whilst driving or stationary. An electronic unit (wheelunit) inside each tire, mounted to the valve stem, periodically measures the actual tire pressure.By means of RF communication, this pressure information is transmitted to the RFreceiver/decoder.2.TECHNICAL DESCRIPTIONCarrier frequency:433.92 MHzFrequency FSK deviation:40 kHz maxNumber of channels:1Type of modulation:Frequency Shift Keying (FSK)Baud rate:9600bdsRated Output Power:< 10mWAntenna:InternalVoltage supply:1 Lithium battery 3V (CR2450)Voltage supply range:2.1 up to 3.2V
3of53.TYPICAL USAGE PATTERNDUTY CYCLE CALCULATION (EN 300 220-1)PARKING: 1 burst transmission every 13H + 1 WUP transmissionFIRST BLOCK: During 2 minutes after vehicle start, burst emission every 16.8s (8 burst emission)INTERIM FIRST BLOCK: none transmissionDRIVING: 1 burst emission every 67.2s during the rest of the hour (54 burst emission)INTERIM: none transmission=> During 1 hour, the Wheel Unit transmits 63 bursts+ 1 WUP.1 burst = 30.29806ms MAX1 WUP length max = 42.1ms MAXtotal transmission during 1 hour = 63 x 30.29806ms +42.1ms= 1.96sDUTY CYCLE = (1.96 / 3600) x 100% =0.06%AVERAGE FACTOR CALCULATION (Standard 47 CFR Part 15C (periodic intentionaltransmitter))WUP definition:-Modulation FSK for the WUP-10 blocks in the WUP-5 bytes à "00" manchester in each blocksWUP length = 41.664ms 1% (max = 42.1ms)Averaging factor = 20xlog(42.1/100)=-7.5dB
4of54.BLOCK DIAGRAMThe block diagram below shows the main electronic units of the wheel unit:3VLITHIUMBATTE RYLearning coilRF CIRC UITANTEN NAPressure,tem peratu re ,accelerationsensor andµcontroller
5of55.PICTURELabelContinentalS180052020FCC ID:KR5S180020IC:7812D-S180020Operation is subject to the following two conditions: (1) this devicemay not cause harmfulinterference, and (2) this device must accept any interference received, including interferencethat may cause undesired operation.USA:This device complies with Part 15 of the FCC Rules. Operation is subject to the following twoconditions: (1) this device may not cause harmful interference, and (2) this device must acceptany interference received, including interference that may cause undesired operation.Changes or modifications not expressly approved by the party responsible for compliancecould void the user's authority to operate the equipment.

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